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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f088ab603964248f463d23ac8da9bf669a8bc6f6c691ad6aacd4b57ed387117' 
  AND token = '0YEcGqvHaf0RgTCtPHLFvZv4Oud8Sbf9rqL/D4Bx5xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}